Abdominal exercise device



FIG. 1 is a top plan view of the abdominal exercise device according to the present design;

FIG. 2 is a front elevational view of the abdominal exercise device shown in FIG. 1;

FIG. 3 is a side elevational view of the abdominal exercise device shown in FIG. 1;

FIG. 4 is a rear elevational view of the abdominal exercise device shown in FIG. 1;

FIG. 5 is a bottom plan view of the abdominal exercise device shown in FIG. 1; and,

FIG. 6 is a perspective view of the abdominal exercise device shown in FIG. 1. 

The ornamental design for an abdominal exercise device, as shown and described. 